package com.hua.gulimall.product.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hua.common.utils.PageUtils;
import com.hua.common.utils.Query;
import com.hua.gulimall.product.dao.CategoryDao;
import com.hua.gulimall.product.entity.AttrGroupEntity;
import com.hua.gulimall.product.entity.CategoryEntity;
import com.hua.gulimall.product.service.CategoryBrandRelationService;
import com.hua.gulimall.product.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    /*@Autowired
    CategoryDao categoryDao;*/

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.获取所有列表
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装成树形结构

        //2.1查询出所有的一级分类,
        /*List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid() == 0;
        }).collect(Collectors.toList());*/
        //简写
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
                categoryEntity.getParentCid() == 0
        ).map((menu)->{
            menu.setChildren(childrens(menu,entities));
            return menu;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return level1Menus;
    }

    /**
     * 利用递归查询所以子菜单
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> childrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //找到子菜单
            categoryEntity.setChildren(childrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }



    /**
     * 找到catelogId的完整路径；
     * 【父/子/孙】
     * @param catelogId
     * @return
     */
    @Override
    public Long[] findCateLogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findRarentPath(catelogId,paths);
        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);


    }

    /**
     * 更新所有关联数据
     * @param category
     */
    @Override
    public void updateCascade(CategoryEntity category) {

        this.updateById(category);

        categoryBrandRelationService.updateCateory(category.getCatId(),category.getName());


    }

    private List<Long> findRarentPath(Long catelogId, List<Long> paths) {
        // 收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid() != 0){
             findRarentPath(byId.getParentCid(),paths);
        }

        return paths;

    }

}